Girlfriend giving house directions 2 her boyfriend

Girlfriend giving house directions 2 her boyfriend

"Come to the front gate of my apartment where you drop me,
Look for flat 9a,
you will find a lift on ur right.
Hit 9 with ur elbow,
Get out of the lift u will find my flat on left....
Hit the doorbell with your elbow & i will get the door 4u"

boyfriend says- dear that seems easy
but why m i hitting buttons with my elbows?
Girlfriend:oh! Sorry, that mean you coming empty handed?")
boyfriend: (speechless) :/ :d